ABB H82351 Series Operating Instructions Manual page 11

Note
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Operating Instructions 2TMD041700D0041
Any of the eight zones can be connected as one of the above four ways,
according to the actual situation.
For the connection of the same type of zones, please according to
"Connection of multiple detectors"
The unused zone interfaces should be closed in the "Set alarm zone
attribute" or the interfaces should be ground shielded with a 10 K resistor.
It needs to be set in the zone property after the connection is finished.
You can use "Start test mode" to detect whether the zone is working
properly. For details, please refer to the chapter "Set alarm zone attribute".
Product description
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